Abstract
The compatibility of bismuth compounds as a sintering aid for (ZrO 2)0.89(ScO1.5)0.1(CeO 2)0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO15 considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO1.5 in ScSZ was less than 2 mol%. Dispersion of Bi2O3 at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.
Original language | English |
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Pages (from-to) | 184-189 |
Number of pages | 6 |
Journal | Electrochemistry |
Volume | 77 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2009 Feb |
Keywords
- Densification
- Electrolyte
- Scandia stabilized zirocnia
- Sintering additions
- Solid oxide fuel cells
ASJC Scopus subject areas
- Electrochemistry